Properties Of Solids And Liquids Question 59

Question: A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is [UPSEAT 2002]

Options:

A) 3.75 J

B) 37.5 J

C) 0.375 J

D) 0.75 J

Show Answer

Answer:

Correct Answer: A

Solution:

According to energy conservation, change in kinetic energy appears in the form of heat (thermal energy). therefore i.e. Thermal energy =12m(v12v22)

[W(Joule)=Q(Joule)]

=12(100×103)(10252)=3.75J



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